EP1657036A1 - Fräswerkzeug - Google Patents

Fräswerkzeug Download PDF

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Publication number
EP1657036A1
EP1657036A1 EP05110456A EP05110456A EP1657036A1 EP 1657036 A1 EP1657036 A1 EP 1657036A1 EP 05110456 A EP05110456 A EP 05110456A EP 05110456 A EP05110456 A EP 05110456A EP 1657036 A1 EP1657036 A1 EP 1657036A1
Authority
EP
European Patent Office
Prior art keywords
insert
milling tool
front face
radial seating
seating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05110456A
Other languages
English (en)
French (fr)
Inventor
Luca Solari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STARK SPA
Original Assignee
STARK SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STARK SpA filed Critical STARK SpA
Publication of EP1657036A1 publication Critical patent/EP1657036A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G13/00—Cutter blocks; Other rotary cutting tools
    • B27G13/08—Cutter blocks; Other rotary cutting tools in the shape of disc-like members; Wood-milling cutters
    • B27G13/10—Securing the cutters, e.g. by clamping collars

Definitions

  • the present invention concerns a milling tool used essentially but not only for working wood.
  • the tool according to the invention is of the type comprising a rotary main body, on the periphery of which one or more cutting inserts are mounted.
  • Milling tools are known, used in working wood in order to obtain different types of articles making grooves, notches or other, on a block of un-worked wood.
  • Known tools comprise a rotary main body, on the periphery of which a plurality of radial seatings are made, each of which houses inside it a relative cutting insert and a corresponding clamping element, or block, clamped under pressure in the seating.
  • the block When the cutting insert is assembled or replaced, the block can be made to slide on a bottom surface of the relative radial seating in order to thrust and stably clamp the cutting insert against a corresponding supporting surface or shoulder of the radial seating.
  • One purpose of the present invention is to achieve a milling tool which can use high speeds and relatively heavy cutting inserts, guaranteeing in any case a sure grip of the cutting inserts.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a milling tool comprises a rotary main body provided with at least a radial seating, which is able to house a cutting insert and relative clamping means, for example a block, in order to clamp the insert against a supporting surface of the radial seating.
  • the insert comprises a front face, able to cooperate with the clamping means, and a rear face opposite the front face and able to be thrust on said supporting surface with a determinate pressure, which achieves the clamping of the insert on the main body.
  • At least a segment of said rear face of the insert is converging towards said front face so as to define a cross section that reduces in the direction going from the lower edge to the upper edge of the insert, that is, from the center to the periphery of the main body when the insert is in its assembled position.
  • the part of the radial seating where the insert is housed includes during use a cross section mating with that of the cutting insert.
  • the rear face of the cutting insert disposed during use in contact with the supporting surface of the radial seating, comprises at least a first lower part and a second upper part, substantially aligned with respect to each other, and at least an intermediate part, comprised between the two.
  • the first lower part and the second upper part define a reference plane, substantially parallel to that defined by the front face of the insert, the function of which is to ensure a precise positioning of the insert at the start of working.
  • the intermediate part is converging towards the front face in the direction going from the bottom to the top of the insert, and is disposed in contact with the supporting surface of the radial seating.
  • the supporting surface is also inclined by an equal angle with respect to the reference plane defined by the two aligned parts of said rear face, so as to create a conical coupling which prevents the insert from escaping from the radial seating due to mechanical clamping.
  • the intermediate part is advantageously inclined by an angle comprised between 2° and 10°, with respect to the reference plane defined by the first lower part and the second upper part.
  • a milling tool 10 is used to make grooves or other types of notches on blocks of un-worked or semi-worked wood, so as to obtain desired profiles on the visible surfaces of said blocks.
  • the milling tool 10 comprises a main body 11, in this case cylindrical, rotating around an axis X and on the periphery of which a plurality of radial seatings 12 are made, each of which houses a cutting insert 13 and a corresponding clamping device 14.
  • Each radial seating 12 (figs. 1 and 3) comprises a supporting shoulder 15 for the insert 13 and a bottom surface 16, cooperating with the clamping device 14.
  • the insert 13 (figs. 1 and 2) comprises an outer surface 27, a lower surface 26 opposite and parallel the outer surface 27, a rear face 30 which during use is thrust under pressure against the shoulder 15, and a front face 24 opposite the rear face 30.
  • the bottom surface 16 (figs. 1 and 3) of the radial seating 12 comprises, in this case, a first segment 16a, inclined towards the inside of the radial seating 12 by an angle ⁇ , comprised between 80° and 90° with respect to a cutting radius R, passing through the front edge of the outer surface 27, and a second segment 16b, adjacent and offset with respect to the first segment 16a and inclined by an angle ⁇ , with respect to the latter, towards the outside of the radial seating 12.
  • the shoulder 15 (figs. 1 and 3), in this case, is made adjacent and perpendicular to the second segment 16b, so as to be inclined towards the inside of the radial seating 12.
  • the clamping device 14 (fig. 1) comprises a shaped block 17, which cooperates with the insert 13 to keep it pressed, with great pressure, against the shoulder 15, and a screw 20, accessible from outside, which thrusts the block 17 against the insert 13.
  • the screw 20 can be screwed in a relative through hole 21, made in correspondence with the radial seating 12 on the opposite side with respect to the shoulder 15.
  • the block 17 comprises a lower surface 22, sliding on the first segment 16a of the bottom surface 16 of the radial seating 12, a contact surface 23, which contacts the front face 24 of the insert 13, and a sliding surface 25, on which the lower surface 26 of the insert 13 is able to slide.
  • the progressive screwing of the screw 20 determines a corresponding thrust of the insert 13 towards the outside of the radial seating 12, so as to keep constant the cutting radius R of the milling tool 10 at the same value as prior to sharpening.
  • the rear face 30 (fig. 2) comprises in this case a first lower part 31, a second upper part 32 and an intermediate part 33, comprised between the two parts 31 and 32.
  • the first lower part 31 and the second upper part 32 are aligned with each other along a reference plane B, substantially parallel to a plane containing the front face 24.
  • the intermediate part 33 originates on the upper edge of the first lower part 31, ends in proximity with the lower edge of the second upper part 32 and is inclined towards the front face 24, in the direction of the periphery of the main body 11, that is, from the bottom towards the top of the insert 13, by an angle ⁇ with respect to the reference plane B (fig. 2).
  • the cross section of the insert 13 is reduced in a radial direction, that is, the section of the insert 13 progressively decreases as it goes towards the outside of the main body 11.
  • the shoulder 15 has an inclination with respect to an orthogonal line originating from the second segment 16b of the bottom surface 16 of the radial seating 12, by an equal angle ⁇ .
  • the angle ⁇ is equal to about 5°.
  • the contact between the intermediate part 33 and the shoulder 15, and between the contact surface 23 of the block 17 and the front face 24 of the insert 13, determines a conical coupling between the insert 13 and the part of the radial seating 12 comprised between the shoulder 15 and said contact surface 23 where, during use, the insert 13 is housed.
  • This embodiment therefore allows to increase, in safety, the speed of rotation usable with inserts even of great weight.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Milling Processes (AREA)
EP05110456A 2004-11-10 2005-11-08 Fräswerkzeug Withdrawn EP1657036A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUD20040210 ITUD20040210A1 (it) 2004-11-10 2004-11-10 Utensile di fresatura

Publications (1)

Publication Number Publication Date
EP1657036A1 true EP1657036A1 (de) 2006-05-17

Family

ID=35781385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05110456A Withdrawn EP1657036A1 (de) 2004-11-10 2005-11-08 Fräswerkzeug

Country Status (2)

Country Link
EP (1) EP1657036A1 (de)
IT (1) ITUD20040210A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE457187C (de) * 1928-03-10 Karl Guenther Fraeser mit auswechselbaren Zaehnen oder Messern zur Holzbearbeitung
DE1111800B (de) * 1956-05-15 1961-07-27 Montanwerke Walter A G Umlaufendes Schneidwerkzeug, insbesondere fuer Holzbearbeitung
US3303556A (en) * 1964-03-12 1967-02-14 Illinois Tool Works Inserted blade rotary cutter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE457187C (de) * 1928-03-10 Karl Guenther Fraeser mit auswechselbaren Zaehnen oder Messern zur Holzbearbeitung
DE1111800B (de) * 1956-05-15 1961-07-27 Montanwerke Walter A G Umlaufendes Schneidwerkzeug, insbesondere fuer Holzbearbeitung
US3303556A (en) * 1964-03-12 1967-02-14 Illinois Tool Works Inserted blade rotary cutter

Also Published As

Publication number Publication date
ITUD20040210A1 (it) 2005-02-10

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